Stupid as it might seem, how do you turn this thing on? I used it for a while a couple of days ago, and now the thing just won’t turn on.

I have tried a short press, a long press, a super-long press, and nothing works. Is my power button broken? The unit is getting power, mind you. I reattached the power cable and the blue LED light comes alive for a moment. But after that, the power button does nothing.